Features 【Simpler Control】: Installed on single chip microcomputer, the keypad module will largely simplify the operation. 【Good Durability】: Adopting premium materials, works with high efficiency, very sturdy and durable for long use. 【Easy to Install】: Comes with pin headers and installation holes, the lightweight module is very easy to install. 【Individual Keys】: All the 8 keys are independent and not influence each other, ensuring stable work performance. 【With 8 Buttons】: Including 8 buttons in 2 x 4 matrix arrangement, this button key module is also a micro switch. Specification: Item Type: Button Key Module Specification: 2 x 4 matrix keyboard. Function: External expansion keyboard of single chip microcomputer. Board Size: Approx. 34 x 32mm / 1.34 x 1.26in (excluding protruding parts).  Package List:1 x Button Key Module Package List 1 x Button Key Module